samples t-test, decides to use an unequal variance t-test (Welch's t-test). Why might they have decided to use this? options: The variance of group A in the study is 3.5 times greater than the variance of group B Box plots indicate that the distributions are strongly skewed The data for the two groups appear to be pseudo replicated The box plots indicate that there are outliers in the two distributions. b. A study which examines breast cancer survival rates at 5 different hospitals takes data from 30 patients at each hospital. This would be an example of a: Question 2 options: Simple random sampling design Stratified random sampling design Hierarchical sampling design Cluster sampling design
a. A researcher carrying out an independent samples t-test, decides to use an unequal variance t-test (Welch's t-test). Why might they have decided to use this?
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The variance of group A in the study is 3.5 times greater than the variance of group B |
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Box plots indicate that the distributions are strongly skewed |
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The data for the two groups appear to be pseudo replicated |
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The box plots indicate that there are outliers in the two distributions. |
b. A study which examines breast cancer survival rates at 5 different hospitals takes data from 30 patients at each hospital. This would be an example of a:
Question 2 options:
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Simple random sampling design |
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Stratified random sampling design |
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Hierarchical sampling design |
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Cluster sampling design |
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